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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)        
Foreign currency translation adjustment, tax amount $ 0 $ 0 $ 0 $ 0